Common Elements:
Amon (pl. Emyn) ~ Hill
Orod (pl. Ered) ~ Mountain
Dol ~ ‘head’ often applied to hills and mountains
North Downs:
- Dol Dínen (dínen meaning silent). From what I remember of the area, although its in a valley it is still hilly, I guess Silent Hills.
- Amon Amrûn (amrûn meaning east, orient¹). Eastern Hill perhaps.
- Amon Raith (raith is pl. of rath meaning ways or paths²). Hill of Paths.
- Dol Nendír (nen meaning water (nend = watery¹), dír is from tír meaning watchful). My closest guess is Hill of Watchful Water.
Lone-lands:
- Amon Sûl (sûl meaning wind) This is famously known as Weathertop, situated in the Weather Hills.
- Amon Ros (ros meaning spray or foam, ross meaning rain¹) Hill of Rain, I think.
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(Translations are from the Appendix: Elements in Quenya and Sindarin, The Silmarillion, J.R. R. Tolkien unless otherwise noted. I am not an expert at all – if you see any mistakes please let me know!)
¹ Hiswelókë’s Sindarin Dictionary (both Sindarin to English and analogical English to Sindarin)
² Lotro forum thread by Laire

